CI: Update codecov/codecov-action to v4

Author: SirLynix

.github/workflows/coverage.yml

@@ -116,7 +116,8 @@ jobs:
         "C:\Program Files\OpenCppCoverage\OpenCppCoverage.exe" --export_type cobertura:coverage.out --sources "NazaraUtils\include\Nazara\*" --modules "NazaraUtils\bin\*" --cover_children -- xmake run UnitTests
 
     - name: Upload Coverage Report to Codecov
-      uses: codecov/codecov-action@v3
+      uses: codecov/codecov-action@v4
       with:
         files: ./coverage.out
         fail_ci_if_error: true
+        token: ${{ secrets.CODECOV_TOKEN }}